package com.kayak.weixin.util;

import java.io.InputStream;
import java.io.Writer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.kayak.weixin.msg.response.ImageMessage;
import com.kayak.weixin.msg.response.MusicMessage;
import com.kayak.weixin.msg.response.NewsMessage;
import com.kayak.weixin.msg.response.TextMessage;
import com.kayak.weixin.msg.response.VideoMessage;
import com.kayak.weixin.msg.response.VoiceMessage;
import com.kayak.weixin.msg.response.model.Article;
import com.kayak.weixin.msg.template.TemplateMessage;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XppDriver;

/**
 * 消息处理工具类
 * @author myt
 *
 */
public class MsgUtil {
	
	//###########请求消息类型####################

	//请求消息类型：文本
	public static final String REQ_MESSAGE_TYPE_TEXT = "text";

	//请求消息类型：图片
	public static final String REQ_MESSAGE_TYPE_IMAGE = "image";

	//请求消息类型：音频消息 
	public static final String REQ_MESSAGE_TYPE_VOICE = "voice";
	
	//请求消息类型：视频消息
	public static final String REQ_MESSAGE_TYPE_VIDEO = "video";
	
	//请求消息类型：小视频消息
	public static final String REQ_MESSAGE_TYPE_SHORTVIDEO = "shortvideo";
	
	//请求消息类型：地理位置
	public static final String REQ_MESSAGE_TYPE_LOCATION = "location";

	//请求消息类型：链接
	public static final String REQ_MESSAGE_TYPE_LINK = "link";
	
	//请求消息类型：事件推送
	public static final String REQ_MESSAGE_TYPE_EVENT = "event";
	
	
	//###########事件类型####################
	
	//事件类型：subscribe(订阅)
	public static final String EVENT_TYPE_SUBSCRIBE = "subscribe";

	//事件类型：unsubscribe(取消订阅)
	public static final String EVENT_TYPE_UNSUBSCRIBE = "unsubscribe";

	//事件类型：scan（关注用户扫描带参数二维码）
	public static final String EVENT_TYPE_SCAN = "scan";
	
	//事件类型：LOCATION（上报地理位置）
	public static final String EVENT_TYPE_LOCATION = "LOCATION";
	
	//事件类型：CLICK(自定义菜单点击事件)
	public static final String EVENT_TYPE_CLICK = "CLICK";
	
	
	 //###########响应消息类型####################
	
	//响应消息类型：文本 
	public static final String RESP_MESSAGE_TYPE_TEXT = "text";

	//响应消息类型：图片
	public static final String RESP_MESSAGE_TYPE_IMAGE = "image";
	
	//响应消息类型：语音消息
	public static final String RESP_MESSAGE_TYPE_VOICE = "voice";
		
	//响应消息类型：视频消息
	public static final String RESP_MESSAGE_TYPE_VIDEO = "video";
			
	//响应消息类型：音乐
	public static final String RESP_MESSAGE_TYPE_MUSIC = "music";

	//响应消息类型：图文
	public static final String RESP_MESSAGE_TYPE_NEWS = "news";
	
	/**
	 * 扩展xstream，使其支持CDATA块
	 * 
	 * @date 2013-05-19
	 */
	private static XStream xstream = new XStream(new XppDriver() {
		public HierarchicalStreamWriter createWriter(Writer out) {
			return new PrettyPrintWriter(out) {
				// 对所有xml节点的转换都增加CDATA标记
				boolean cdata = true;

				public void startNode(String name, Class clazz) {
					super.startNode(name, clazz);
				}

				protected void writeText(QuickWriter writer, String text) {
					if (cdata) {
						writer.write("<![CDATA[");
						writer.write(text);
						writer.write("]]>");
					} else {
						writer.write(text);
					}
				}
			};
		}
	});

	/**
	 * 解析微信发来的请求（XML）
	 * 
	 * @param request
	 * @return
	 * @throws Exception
	 */
	@SuppressWarnings("unchecked")
	public static Map<String, String> parseXml(HttpServletRequest request)
			throws Exception {
		// 将解析结果存储在HashMap中
		Map<String, String> map = new HashMap<String, String>();

		// 从request中取得输入流
		InputStream inputStream = request.getInputStream();
		// 读取输入流
		SAXReader reader = new SAXReader();
		Document document = reader.read(inputStream);
		// 得到根元素
		Element root = document.getRootElement();
		// 得到根元素的所有子节点
		List<Element> elementList = root.elements();

		// 遍历所有子节点
		for (Element e : elementList)
			map.put(e.getName(), e.getText());

		// 释放资源
		inputStream.close();
		inputStream = null;

		return map;
	}

	/**
	 * 文本消息对象转换成xml
	 * 
	 * @param textMessage
	 *            文本消息对象
	 * @return xml
	 */
	public static String messageToXml(TextMessage textMessage) {
		xstream.alias("xml", textMessage.getClass());
		return xstream.toXML(textMessage);
	}
	
	/**
	 * 图片消息对象转换成xml
	 * 
	 * @param imageMessage
	 *            图片消息对象
	 * @return xml
	 */
	public static String messageToXml(ImageMessage imageMessage) {
		xstream.alias("xml", imageMessage.getClass());
		return xstream.toXML(imageMessage);
	}
	
	/**
	 * 语音消息对象转换成xml
	 * 
	 * @param voiceMessage
	 *            语音消息对象
	 * @return xml
	 */
	public static String messageToXml(VoiceMessage voiceMessage) {
		xstream.alias("xml", voiceMessage.getClass());
		return xstream.toXML(voiceMessage);
	}
	
	/**
	 * 视频消息对象转换成xml
	 * 
	 * @param videoMessage
	 *            视频消息对象
	 * @return xml
	 */
	public static String messageToXml(VideoMessage videoMessage) {
		xstream.alias("xml", videoMessage.getClass());
		return xstream.toXML(videoMessage);
	}

	/**
	 * 音乐消息对象转换成xml
	 * 
	 * @param musicMessage
	 *            音乐消息对象
	 * @return xml
	 */
	public static String messageToXml(MusicMessage musicMessage) {
		xstream.alias("xml", musicMessage.getClass());
		return xstream.toXML(musicMessage);
	}

	/**
	 * 图文消息对象转换成xml
	 * 
	 * @param newsMessage
	 *            图文消息对象
	 * @return xml
	 */
	public static String messageToXml(NewsMessage newsMessage) {
		xstream.alias("xml", newsMessage.getClass());
		xstream.alias("item", new Article().getClass());
		return xstream.toXML(newsMessage);
	}

	/**
	 * 模板消息对象转换成xml
	 * 
	 * @param templateMessage
	 *            模板消息对象
	 * @return xml
	 */
	public static String messageToXml(TemplateMessage templateMessage) {
		xstream.alias("xml", templateMessage.getClass());
		return xstream.toXML(templateMessage);
	}
	
	/**
	 * 计算采用utf-8编码方式时字符串所占字节数
	 * 
	 * @param content
	 * @return
	 */
	/*public static int getByteSize(String content) {
		int size = 0;
		if (null != content) {
			try {
				// 汉字采用utf-8编码时占3个字节
				size = content.getBytes("utf-8").length;
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
		}
		return size;
	}*/

	/**
	 * 判断是否是QQ表情
	 * 
	 * @param content
	 * @return
	 */
	/*public static boolean isQqFace(String content) {

		// 判断QQ表情的正则表达式
		boolean result = false;
		String qqfaceRegex = "/::\\)|/::~|/::B|/::\\||/:8-\\)|/::<|/::$|/::X|/::Z|/::'\\(|/::-\\||/::@|/::P|/::D|/::O|/::\\(|/::\\+|/:--b|/::Q|/::T|/:,@P|/:,@-D|/::d|/:,@o|/::g|/:\\|-\\)|/::!|/::L|/::>|/::,@|/:,@f|/::-S|/:\\?|/:,@x|/:,@@|/::8|/:,@!|/:!!!|/:xx|/:bye|/:wipe|/:dig|/:handclap|/:&-\\(|/:B-\\)|/:<@|/:@>|/::-O|/:>-\\||/:P-\\(|/::'\\||/:X-\\)|/::\\*|/:@x|/:8\\*|/:pd|/:<W>|/:beer|/:basketb|/:oo|/:coffee|/:eat|/:pig|/:rose|/:fade|/:showlove|/:heart|/:break|/:cake|/:li|/:bome|/:kn|/:footb|/:ladybug|/:shit|/:moon|/:sun|/:gift|/:hug|/:strong|/:weak|/:share|/:v|/:@\\)|/:jj|/:@@|/:bad|/:lvu|/:no|/:ok|/:love|/:<L>|/:jump|/:shake|/:<O>|/:circle|/:kotow|/:turn|/:skip|/:oY|/:#-0|/:hiphot|/:kiss|/:<&|/:&>";
		Pattern p = Pattern.compile(qqfaceRegex);
		Matcher m = p.matcher(content);
		if (m.matches()) {
			result = true;
		}
		return result;
	}*/
}